Authorities say Pelzer stabbed 80-year-old Po Lin Wan and 47-year-old Alice Mei See Leung to death during a robbery attempt in May 2012. Pelzer allegedly attacked Leung with a 12-inch butcher knife then turned on Wan when she tried to intervene. The Scarborough, Ontario women each died at a hospital.

Pelzer’s public defender previously said her client had been diagnosed with schizophrenia.

Pelzer, of Philadelphia, could face two consecutive life sentences under the terms of her plea agreement. Sentencing is scheduled for Oct. 24.